There are a couple ways to get purple in soap using natural colorants.  My favorite herb to use is alkanet infused in olive oil.  But I wanted to try something different.  For this soap I used indigo and madder added to the lye water.  Here’s what I did…

The recipe – 2 oz castor, 8 oz coconut, 8 oz lard, 10 oz olive oil, 3.9 oz lye & 8 oz water.

Add 1/4 teaspoon of madder root powder and 1/4 teaspoon of indigo powder to your water before you add the lye.

Add the lye slowely while stirring.

Melt the solid oils, add the liquid oils and add your fragrance.  I used lavender essential oil.

Once your oils and lye solution are ready…pour the lye solution into the oils.  I poured my lye solution through a stainless steel strainer to strain out some of the herb powder.

Stickblend to trace.

Pour it into the mold.  I let mine set up a bit and  teased the top with a craft stick.  Then I added some lavender buds.

Since the top of the soap didn’t reach above the mold I covered with a piece of wax paper and a piece of wood and set it on a heating pad to go through gel.  Here it is in gel stage.

The next morning it was ready to cut.  Here’s a tip on cutting soap with botanicals on the top without getting the “botanical drag” through the soap.  Lay the soap on it’s side and cut in that position.  It won’t drag the buds down through the soap  like if you were cutting from top down.

So overall I’m pretty happy with the outcome.  It’s not a dark or very striking purple that you can achieve using alkanet.  It’s more of a dusty vintage type of purple.  I think if it were a flat plain bar it would be a bit boring…but the sculpted tops and light sprinkle of lavender buds make it all come together and look pretty good.  I’m happy with it.


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Thanks for being a part of the Lovin’ Soap community! We’re so glad you’re here!

Now through March 1st, we are having a presale on our newest eClass, Clear Transparent Soap from Scratch!

In this video eCourse, I will show you:

  • How to formulate your own transparent soap recipe that is remelt-able and reusable…similar to MP soap base.
  • We’ll go over base oils and solvents that are available to use and why you would select each type of ingredient.
  • How to make quick hot process transparent soap from scratch. It only takes about 20 minutes once you get the process down!
  • How to remelt and use your base for future projects.

About the soap:

  • The ingredients we use include coconut oil, stearic acid, castor oil, sodium hydroxide, everclear (grain alcohol) and sugar.
  • The soap is remeltable and you can work with it like melt and pour soap base.
  • You can create bars of soap or embeds that you can add to regular cold process soap.
  • You’ll get different varieties of clarity in your soap…we’ll talk about that.

The class will be delivered in a a series of videos and downloadable PDF’s. You’ll have forever access and be able to watch over and over again as you want.

Happy Soaping! -Amanda Aaron